Berserk Chicken

Cluck. The chicken lays an Egg.

Rage. As a bonus action, the chicken enters rage. The chicken gains resistance to damage except psychic for one minute, and can't use this ability again until it takes a short or long rest.

Flee. The Chicken moves up to twice its walking speed.

Peck. Melee Weapon Attack: +1 to hit, reach 3ft., one target. Hit: 1 (1d4 - 1) [piercing ] damage. 

Axe. Melee Weapon Attack: +4 to hit, reach 5ft. one target. Hit: (1d8-1) Slashing damage. 

Bad Fly. The chicken makes a DEX saving throw on being hit. On a success, it takes all the damage minus 3, and gains a flying speed of 10 feet. It must use this speed to move away from the thing that did damage to it. It loses this flying speed at the start of its next turn.